Heterobimetallic catalysts and site-differentiated ligands for preparation thereof
AssigneeUniversity of Houston System
InventorsLoi Hung Do, Zhongzheng Cai, Thi Tran, Dawei Xiao
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Abstract
Phosphine phosphonate and phenoxyphosphine ligands bearing polyethylene glycol (PEG) chains are used as described herein to produce heterobimetallic catalysts. The ligands can be metallated selectively with palladium or nickel and secondary metal ions to provide well-defined heterobimetallic compounds. These heterobimetallic complexes exhibit accelerated reaction rates and greater thermal stability in olefin polymerization compared to other catalysts.
Claims9
A heterobimetallic catalyst having a structure selected from:
- wherein Ar is Ph, (2,6-dimethoxy)Ph or (2-MeO)Ph, Ph is a phenyl group, PPh3 is triphenylphosphine, PMe3 is trimethylphosphine, M is Li, Na, or K, R is an alkyl or aryl group, and X is an electron donating or withdrawing group.
A heterobimetallic catalyst having a structure of:
- wherein Ph is a phenyl group and PMe3 is trimethylphosphine.
A heterobimetallic catalyst having a structure selected from:
- wherein Ar is an aromatic group, Ph is a phenyl group, PPh3 is triphenylphosphine, PMe3 is trimethylphosphine, M is Li, Na, or K, R is an alkyl or aryl group, and X is an electron donating or withdrawing group.
Dependencies are inferred from the claim text.